As of March 18, 2026, US spot Bitcoin ETFs recorded net inflows of approximately $179 million (2,492 BTC). This daily figure continues the trend of sustained institutional buying, with cumulative net inflows over the past seven days reaching approximately $734 million (10,210 BTC).
Bitcoin ETFs Attract $179 Million in a Single Day, Weekly Net Inflows Hit $734 Million
Over the past seven days, total net capital inflows into spot Bitcoin ETFs have surged to approximately $734 million (10,210 BTC). Both Bitcoin and USD denominated figures indicate sustained buying pressure rather than large single-day allocations.
Ethereum ETF Flows on March 18
The data snapshot tracking Bitcoin ETF flows also includes Ethereum ETF data. However, at the time of the original data release, complete Ethereum figures were truncated, rendering the total net Ethereum ETF flows for the day and the past seven days partially unavailable in the report.
It is known that US spot Ethereum ETFs, which began trading in mid-2026, have historically exhibited lower and more volatile flow patterns compared to their Bitcoin counterparts. Even during periods of steady inflows into Bitcoin ETFs, daily flows for Ethereum ETFs often fluctuate between modest inflows and outflows.
Whether Ethereum ETF flows on March 18 mirrored Bitcoin's positive direction serves as a key indicator for overall institutional exposure to cryptocurrencies. Consistent flows into both Bitcoin and Ethereum ETFs would suggest a general risk-on sentiment in the digital asset market. Conversely, if Bitcoin attracts capital while Ethereum lags, it might reflect a more cautious institutional strategy, favoring Bitcoin's greater liquidity and clearer regulatory standing.
Sustained Weekly Inflows Signal Institutional Demand
The net inflow of 10,210 BTC ($734 million) over the past seven days is not a statistical anomaly. At this rate, spot Bitcoin ETFs are absorbing approximately 1,459 BTC daily, significantly exceeding the post-halving daily mining output of around 450 BTC.
From a macroeconomic calendar perspective, the Federal Reserve's FOMC meeting in March represents the next significant event that could influence ETF flow direction. The Fed's interest rate decisions and forward guidance have historically correlated with short-term volatility in risk asset allocations, including cryptocurrency ETFs.
Current data indicates that institutional buyers are net accumulating Bitcoin through regulated ETF products at a pace that outstrips new supply. Whether this pace accelerates, sustains, or reverses will depend on the interplay between macroeconomic signals, Bitcoin's price action, and the appetite of allocators who have been consistently building positions through Q1 2026.